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Select the number from among the given options that can replace the question mark (?) in the following series.11, 9, 15, 13, 19, ?
Question

Select the number from among the given options that can replace the question mark (?) in the following series.
11, 9, 15, 13, 19, ?

A.

25

B.

17

C.

7

D.

21

Correct option is B

Given: 11, 9, 15, 13, 19, ?
Logic: Each number is increasing by + 4 alternatively.
First series: 11, 15, 19
11 + 4 = 15
15 + 4 = 19
Second series: 9, 13,  ?
9 + 4 = 13
13 + 4 = 17
? = 17.
So, missing number is : 17.
Thus, the correct option is (b) 17.

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